I saw a movie about 3 years ago about a kung fu fighter who had to battle 4 groups of people. Each group used an element (fire, water, air, earth) to camouflage themselves during the fight. The only part I remember really well was when the fighter had to battle the group using earth. They were in these fox holes in the ground and they used wooden harpoons to strike the fighters above ground. I think at the end someone may have dove off a water fall. Thanks for you help! It is driving me crazy not knowing what this movie is